Kushner is married to Trump's daughter, Ivanka, and his appointment is likely to fuel speculation of nepotism in the Trump White House.

He may not even be eligible for the post under a 1967 law that bars government officials from hiring relatives, though whether the regulation applies to cabinet posts is not clear.

The statement announcing Kushner's appointment adds he will not receive a salary while in the Trump administration, further diminishing the likelihood that the appointment would run afoul of the anti-nepotism law.

Kushner played a key role in Trump's campaign and has continued to be one of the most influential figures in the transition team. Prior to politicking, Kushner led his family's real estate company and was publisher of the New York Observer.